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- [21] UNCONDITIONAL STABILITY-CRITERION FOR SYSTEMS OF 3RD ORDER DOKLADY AKADEMII NAUK SSSR, 1975, 222 (02): : 309 - 311
- [23] ON THE ABSOLUTE STABILITY OF THE 3RD-ORDER SYSTEMS WITH 2 NON-LINEAR ELEMENTS VESTNIK MOSKOVSKOGO UNIVERSITETA SERIYA 1 MATEMATIKA MEKHANIKA, 1980, (03): : 88 - 91